On Wed, 24 Apr 2013 10:38:06 -0600, Steve Comstock wrote:

>So-called "unsigned packed-decimal" data is mis-leading
>at best because it cannot be used in any packed decimal
>arithmetic or compare operations....

Unsigned-Packed-Decimal was introduced in the sixth edition of 
the z/Architecture Principles of Operation, SA22-7832-05, along 
with the Decimal-floating-point facility.  The publication date is 
April, 2007

-- 
Tom Marchant

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